PCA9555DBQRG4

Overview

Product Category: Integrated Circuit (IC)

Use: The PCA9555DBQRG4 is a 16-bit I2C-bus and SMBus I/O expander designed for applications requiring GPIO expansion. It provides general-purpose parallel input/output expansion for most microcontroller families via the I2C-bus interface.

Characteristics: - 16-bit remote bidirectional I/O port - Low standby current consumption of 1 µA - Compatible with I2C-bus and SMBus interfaces - Internal power-on reset - Noise filter on SCL/SDA inputs - No glitch on power-up - Supports hot insertion - Active-low reset input - Polarity inversion register - Open-drain interrupt output - Address by three hardware address pins for use of up to eight devices - Latched outputs with high-current drive capability for directly driving LEDs - Low standby current - Operating power supply voltage range of 2.3 V to 5.5 V - 5 V tolerant I/Os - ESD protection exceeds JESD 22, 2000-V human-body model (A114-A) - Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

Package: SSOP (Shrink Small Outline Package)

Essence: The PCA9555DBQRG4 is an essential component in electronic systems that require additional input/output ports beyond what the microcontroller can provide. It allows for easy expansion of GPIO (General Purpose Input/Output) capabilities, enabling the connection of various peripheral devices.

Packaging/Quantity: The PCA9555DBQRG4 is typically sold in reels of 2500 units per reel.

Specifications

• Supply Voltage Range: 2.3 V to 5.5 V
• Input Voltage Range: 0 V to VDD
• Output Voltage Range: 0 V to VDD
• Operating Temperature Range: -40°C to +85°C
• I2C-bus Frequency: 100 kHz, 400 kHz, and 1 MHz

Pin Configuration

The PCA9555DBQRG4 has a total of 24 pins. The pin configuration is as follows:

```

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| | | 1 24 | | | | 2 23 | | | | 3 22 | | | | 4 21 | | | | 5 20 | | | | 6 19 | | | | 7 18 | | | | 8 17 | | | | 9 16 | | | |10 15 | | | |11 14 | | | |12 13 | |_______________| ```

Functional Features

• Bidirectional I/O ports: The PCA9555DBQRG4 provides 16 bidirectional I/O ports that can be independently configured as inputs or outputs.
• I2C-bus/SMBus interface: It supports communication via the I2C-bus and SMBus interfaces, allowing easy integration with microcontrollers.
• Addressing: The device can be addressed using three hardware address pins, enabling the use of up to eight devices on the same bus.
• Interrupt output: The PCA9555DBQRG4 features an open-drain interrupt output that can be used to signal events to the microcontroller.
• Polarity inversion: The polarity inversion register allows for inverting the logic state of the outputs, providing flexibility in driving external devices.
• Low standby current: With a standby current consumption of only 1 µA, the device minimizes power consumption when not actively used.

Advantages and Disadvantages

Advantages: - Easy expansion of GPIO capabilities - Compatible with popular microcontroller families - Low standby current consumption - Supports hot insertion - High-current drive capability for directly driving LEDs

Disadvantages: - Limited to 16 bidirectional I/O ports - Requires additional I2C-bus/SMBus interface for communication

Working Principles

The PCA9555DBQRG4 operates by communicating with a microcontroller via the I2C-bus or SMBus interface. The microcontroller sends commands and data to the PCA9555DBQRG4 to configure its I/O ports as inputs or outputs. The device can then read input states or drive output states accordingly. The bidirectional nature of the I/O ports allows for both reading and writing operations.

Detailed Application Field Plans

The PCA